REACTIVE COMPOUNDING OF ETHYLENE VINYL ACETATE

The present invention provides a method for producing an at least partially crosslinked polymer composition, having a first melt index (MI) value and a first tensile strength, comprising the steps of:a. providing an ethylene vinyl acetate (EVA) copolymer, the EVA copolymer having a second MI value and a second tensile strength and containing at least 30 wt% units derived from vinyl acetate, b. adding from 0.01 to 0.03 wt% of an organic peroxide, wherein the organic peroxide is diluted in 0.001 to 0.05 wt% of white oil, and c. blending the EVA copolymer and the organic peroxide at a temperature sufficient to initiate crosslinking. The first MI value of the at least partially crosslinked polymer composition is less than 5 g/10 min (190DEG C, 2.16 kg). 本发明提供了一种生产具有第一熔体指数(MI)值和第一拉伸强度的至少部分交联的聚合物组合物的方法，该方法包括以下步骤：a.提供一种乙烯-乙酸乙烯酯(EVA)共聚物，该EVA共聚物具有第二MI值和第二拉伸强度并且包含至少30重量％的衍生自乙酸乙烯酯的单元，b.加入0.01重量％至0.03重量％的有机过氧化物，其中将所述有机过氧化物稀释在0.001重量％至0.05重量％的白油中，和c.在足以引发交联的温度下共混所述EVA共聚物和所述有机过氧化物。所述至少部分交联的聚合物组合物的第一MI值小于5g/10min(190℃，2.16k